# convert source domain address to a chain a@b@c@d...@([^@!,]*):([^!@]*)@([^!]*)		alias	\2@\3@\1@([^@!]*),@([^!@,]*):([^!@]*)@([^!]*)	alias	@\1:\3@\4@\2 # convert a chain a@b@c@d... to ...d!c!b!a([^@]+)@([^@]+)@(.+)	alias	\2!\1@\3([^@]+)@([^@]+)		alias	\2!\1 # all mailplan9\.bell-labs\.com!(.*) |	"/mail/lib/qmail '\s' 'net!plan9\.bell-labs\.com'" "'\1'".*			 |	"/mail/lib/qmail '\s' 'net!plan9\.bell-labs\.com'" "'&'"